When Should A Warehouse Use Side Sealing Machines?

Side Sealing Sealing film along the side of a package, commonly as part of automated shrink wrapping. Determining when to invest in side sealing equipment depends on throughput, SKU mix, pack presentation needs, budget, and integration with existing fulfillment systems.

Side sealers are not universally appropriate; they are a targeted solution. Warehouses should evaluate operational drivers and measure benefits across labor, speed, product protection, and packaging consistency. This article lists the decision criteria, practical considerations for implementation, and tips to validate ROI before purchase.

Key Decision Criteria

• Volume: High daily pack counts justify automated side sealing. When manual or L-bar methods become a bottleneck, side sealing can increase throughput and reduce per-pack labor.
• SKU Uniformity: Side sealing is efficient for runs of similar box sizes or multipacks; if your SKU range is highly variable, ensure the chosen machine supports quick changeovers and adjustable guides.
• Product Shape: Rectangular, rink-like, or bundled products that remain stable on conveyors work best. Irregularly shaped items may need additional fixtures or an indexing sealer.
• Presentation Requirements: If seam visibility is acceptable or can be positioned on a non-critical face, side sealing is suitable. For retail-facing invisible seams, consider alternatives (back sealing).

Operational Integration

Assess how a side sealer will join your current line: conveyor height, line speed synchronization, upstream feeding (robotic pick & place or case erector) and downstream equipment (labelers, checkweighers, shrink tunnels). Plan electrical, air, and safety interlocks; modern machines support PLC integration and can accept signals for stop/start, jam detection, and product counting.

Space, Footprint And Layout

Side sealing systems are compact relative to some alternatives, but you must account for feed lanes, film reels, operator access for film splicing, and service clearances. A common layout places the sealer inline with existing conveyors, then a tunnel immediately downstream. Include space for spare film storage and a waste reel if your system trims film edges.

Costs And Return On Investment

Calculate ROI by comparing current labor and material costs against the capital expense, expected film consumption, maintenance, and energy. Consider metrics such as packs per hour, labor hours saved, and reduction in damaged goods. Include soft benefits: improved pack consistency, faster changeovers, and better downstream automation compatibility that can generate value through fewer stoppages and faster cycle times.

Selecting The Right Machine

• Speed Rating: Choose a machine rated above your peak production to avoid running it at maximum capacity continuously.
• Automation Level: Consider automatic film splicing, reel changes, and integrated controls if downtime is costly.
• Material Support: Confirm the machine supports the film types and gauges you plan to use, including heat settings for polyolefin or polyethylene.
• Service And Parts: Buy from a vendor with a strong North American service network and readily available spare parts to minimize downtime.

Implementation Tips

• Pilot Runs: Run production trials with your SKUs and film before committing to a machine. Validate seal strength and shrink behavior across temperature ranges.
• Operator Training: Train multiple operators on film loading, basic maintenance, and jam recovery to prevent single-point knowledge risk.
• Spare Parts Kit: Stock critical items: sealing belts, Teflon covers, thermal fuses, and film guides.
• Process Documentation: Document standard machine settings per SKU so changeovers are repeatable and traceable.

When Not To Use Side Sealing

Avoid investing in side sealing when volumes are low, products are highly irregular and require custom fixtures, or when seam visibility is unacceptable for branding. In these cases, manual sealing, L-bar (back sealing), or flexible packaging alternatives may be more cost-effective.

Practical Example

A mid-sized third-party logistics operator processing a single large retail client's multipacks found a manual shrink station could only handle 250 multipacks per hour with three operators. Installing a continuous inline side sealer and tunnel increased throughput to 1,200 packs per hour, reduced labor to one operator per line, and minimized film waste through better tension control — delivering payback in less than 18 months when measured against labor savings and reduced damage claims.

In short, the Side Sealing machine is an effective investment when your operation needs reliable high-throughput sealing, consistent presentation, and easy integration with automated lines. Evaluate volume, SKU mix, space, and total cost to determine whether side sealing is the right solution for your warehouse.